Preparation method and application of cobalt sulfide having nano-lamella assembled three-dimensional annular micro-nano structure

A micro-nano structure and nano-sheet technology, applied in cobalt sulfide, chemical instruments and methods, nanotechnology, etc., can solve problems such as volume change pulverization, structural collapse, unsatisfactory cobalt sulfide cycle performance and rate performance, etc., to achieve The effect of increasing tap density, improving electrochemical performance, and excellent sodium storage performance

Active Publication Date: 2017-10-13
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charge-discharge cycle of cobalt sulfide, it is easy to cause problems such as pulverization and structural collapse caused by volume change, so that the cycle performance and rate performance of cobalt sulfide cannot meet the needs of commercialization.

Method used

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  • Preparation method and application of cobalt sulfide having nano-lamella assembled three-dimensional annular micro-nano structure
  • Preparation method and application of cobalt sulfide having nano-lamella assembled three-dimensional annular micro-nano structure
  • Preparation method and application of cobalt sulfide having nano-lamella assembled three-dimensional annular micro-nano structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for preparing cobalt sulfide with a three-dimensional annular micro-nano structure assembled by nanosheets, comprising the steps of:

[0028] 1) 1.5g CoCl 2 ·6H 2 O was added to 60ml of ethylenediamine, stirred for 80min to dissolve, and a mixed solution A was obtained, in which Co 2+ The concentration is 0.11mol / L;

[0029] 2) In the mixed solution A obtained in step 1), add 1.1 g of thioacetamide, stir for 80 min to dissolve it, and obtain mixed solution B, wherein Co 2+ The molar concentration ratio with thioacetamide is 0.43;

[0030] 3) Transfer the mixed solution B obtained in step 2) to a polytetrafluoroethylene-lined reactor, and react at 180° C. for 48 hours;

[0031] 4) Suction filter the product obtained in step 3), wash with deionized water and absolute ethanol for 4 times, and dry in a vacuum oven at 60°C for 12 hours to obtain a three-dimensional annular micro-nano-structure cobalt sulfide with nanosheet assembly .

[0032] The crystal struc...

Embodiment 2

[0034] A method for preparing cobalt sulfide with a three-dimensional annular micro-nano structure assembled by nanosheets, comprising the steps of:

[0035] 1) 1.0g CoCl 2 ·6H 2 O was added to 60ml of ethylenediamine, stirred for 60min to dissolve, and mixed solution A was obtained, in which Co 2+ The concentration is 0.07mol / L;

[0036] 2) In the mixed solution A obtained in step 1), add 0.8g thioacetamide, stir for 60min to dissolve it, and obtain mixed solution B, wherein Co 2+ The molar concentration ratio with thioacetamide is 0.39;

[0037] 3) Transfer the mixed solution B obtained in step 2) to a polytetrafluoroethylene-lined stainless steel reactor, and react at 180° C. for 24 hours;

[0038] 4) Suction filter the product obtained in step 3), wash three times with deionized water and absolute ethanol, and dry in a vacuum oven at 60°C for 10 hours to obtain a three-dimensional annular micro-nano-structure cobalt sulfide with nanosheet assembly .

Embodiment 3

[0040] A method for preparing cobalt sulfide with a three-dimensional annular micro-nano structure assembled by nanosheets, comprising the steps of:

[0041] 1) 1.0g CoCl 2 6H2O was added to 40ml of ethylenediamine, stirred for 60min to dissolve, and mixed solution A was obtained, in which Co 2+ The concentration is 0.11mol / L;

[0042] 2) In the mixed solution A obtained in step 1), add 1.2 g of thioacetamide, stir for 80 min to dissolve it, and obtain mixed solution B, wherein Co 2+ The molar concentration ratio with thioacetamide is 0.26;

[0043] 3) Transfer the mixed solution B obtained in step 2) to a polytetrafluoroethylene-lined stainless steel reactor, and react at 180° C. for 48 hours;

[0044] 4) Suction filter the product obtained in step 3), wash three times with deionized water and absolute ethanol, and dry in a vacuum oven at 60°C for 10 hours to obtain a three-dimensional annular micro-nano-structure cobalt sulfide with nanosheet assembly .

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Abstract

The invention belongs to the technical field of sulfide nano-materials, and discloses a preparation method and an application of cobalt sulfide having a nano-lamella assembled three-dimensional annular micro-nano structure. The preparation method comprises the following steps: dissolving CoCl2.6H2O in ethylene diamine, adding thioacetamide, transferring the above obtained solution into a reaction kettle, and washing and drying the obtained product to obtain the cobalt sulfide having a nano-lamella assembled three-dimensional annular micro-nano structure. The method has the advantages of simplicity in operation, easiness in preparation, high controllability, cheap synthesis raw materials and high yield. The cobalt sulfide having a nano-lamella assembled three-dimensional annular micro-nano structure has good electrochemical performances. The initial discharge specific capacity of the cobalt sulfide is 745 mAh / g when the current density is 100 mA / g, and the capacity of the cobalt sulfide still reaches up to 392 mAh / g after 200 cycles when the current density is 1 A / g, so the cobalt sulfide has a good cycle stability, is a sodium ion battery negative electrode material having excellent performances, and has a wide application prospect in the energy storage field.

Description

technical field [0001] The invention belongs to the technical field of sulfide nanomaterials, and in particular relates to a preparation method and application of cobalt sulfide with a three-dimensional annular micro-nano structure assembled by nanosheets. Background technique [0002] With the advancement of electric vehicles and smart grids, the problem of shortage of lithium resources has become increasingly prominent, and the price has increased sharply. Recycling lithium resources alone is not enough to meet the huge demand of the market. Compared with lithium, sodium is abundant, widely distributed, and low-cost, and as an adjacent alkali metal element, it has similar physical and chemical properties to lithium, and sodium-ion batteries have attracted extensive attention in recent years. [0003] Although sodium-ion batteries have potential application value, the radius of sodium ions is larger than that of lithium ions, which makes the kinetics of sodium-ion batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00H01M10/054H01M4/58B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G51/30H01M4/5815H01M10/054Y02E60/10
Inventor 刘学王栋马华徐恒
Owner WUHAN TEXTILE UNIV
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